Details

Sock it to 'em.

The Castelli Free 9 Sock is to regular socks as space shuttles are to balsa-wood gliders—the basic design is similar, but everything that matters is totally different. The Free 9 is woven from Meryl Skinlife fibers, which are engineered to be antimicrobial, highly breathable, and moisture wicking, so your feet stay fresh, dry, and comfortable. A high-density woven band under the arch supports your foot and prevents slippage without adding any extra thickness, a flat toe seam prevents irritation, and an open mesh panel at the cuff increases airflow to provide unbeatable ventilation.

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Best Cycling Socks

The sizing is spot on, and the quality is as expected with any piece of Castelli apparel. Snug fit and smoother material prevents hot spots on long ride, and the high quality definitely makes them on of the longer lasting cycling socks Iâve owned.

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thin, comfy sock

Familiarity: I've put it through the wringer

Fit: True to size

These socks are thin, breathable, and comfortable. I of course bought these for road cycling, but have also used them as a liner sock on a through-hike because of the qualities I mentioned. I agree with John that they'd look a little better if the cuff was a bit longer.

I wear a 47 EU cycling shoe / US 12 casual shoe and the XXL feel just right.

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Completes the Kit

Fit: True to size

Bought these socks to go with my Castelli kits for summer riding. Super thin and comfortable socks that offer superior wicking. My only complaint is that they are on the short side, but still a great sock.

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So nice we made them the kit standard

Familiarity: I've used it several times

Fit: Runs small

Size Bought: l-xl

Height: 6'1"

Weight: 190lbs

In previous years we dealt with custom socks. It took a lot of time, high minimums and frankly the quality was just okay. We chose the Castelli Free 9 and it works great with the kit design. Now we look and feel great and don't have to mess with excess stock. This will be our strategy going forward.

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Tight Fit

Fit: True to size

After trying a couple of brands I have found the the Free 9 socks have an appeal that I enjoy while riding. They are not to hot for the humid weather that I ride in most of the summer and fall. They have lasted a couple dozen rides without losing shape. The feel in the shoe is like a second skin with the protection for the 100km rides.

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The best summer socks!

Familiarity: I've put it through the wringer

I have four pair of these socks. They are the best summer socks I have owned. I have tried socks from companies like Rapha, Swiftwick, and Defeet, and these are the best. They fit like a good cycling sock should. They don't bunch up and they are not too loose. If you have a nice pair of cycling shoes, I highly recommend getting a good pair of socks so your shoes will fit like they should. I wear a size 45 in Sidi and the L/XL fits perfectly.

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Great lightweight sock

Familiarity: I've put it through the wringer

I am a women's 9 and I bought a L/XL, though I was weary of the size since a women's 9 is usually a men's 7. Originally this footbed on the sock was way too long, but now fits perfectly after one machine-wash on delicate (had only handwashed before). The band can be rather snug and the logo stretched if you have bigger legs but the sock won't fall down! Great fluoro color, no bunching, and very breathable.

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Nice socks

Familiarity: I've put it through the wringer

These have been great so far this summer. I wear a 9-9.5 size shoe and ordered the L/XL size for these socks. I would go with the smaller size if I order more - the foot area of the sock is just a little too long for my preference (not the height of the sock, the foot area).